#include <stdio.h>

int main()
{
	// printf("please input the value a: \n");
	fprintf(stdout,"please input the value a: \n");
	
	int a;
	//scanf("%d",&a);
	fscanf(stdin,"%d",&a);

	if(a<0){
		fprintf(stderr,"the value must > 0\n");
		return 1;
	}

	return 0;
}
